Scale.



A 11.111511111111111 @L B. W. KING.

SCALE.

APPLICATION FILED P51121, 1910.

Patented .1111?1891911.

UNITED .STATES PATENT OFFICE.

-LoIILs 4tAENI'oIIE-f1y' AND BERT W. KING, or DETRQIT, MICHIGAN,l AssIGNoEs To STANDARD coMIgUTING scALE COMPANY, LIMITED, oEDETItoI/T, MICHIGAN, A

LIMITED y:PARTNIElRSHII'.

Specification of Letters Patent.

Applicatonled February 21, 1910. Serial No. 545,091.

SCALE.

Patented July 1'8, 1911.

.'Toelli whom it-Jmay concern:

' Beeitknown 'that we, LOUIS'JAENICHEN and lBERT W. KING, citizens of the United States, and lresidents of Detroit, in the 'county of W'ayne and `State of Michigan,-

jments 'wis to provide a: spring mechanism for Scales which" shall be readily adjustable to compensate for variations in temperature;

In the accompanying drawings, Figure 1 is a vertical 4cross section of thev indicating drum and the upperpart ofthe supporting frame of a spring scale on the lineof the kdru'rn` axis. .Figa 2 is an elevation of the frame of the adjusting devicelf Fig. 3v is a plalgr'ofy-thev adjusting device. "Fig 4 is an elevation'rof the actuating knob and the in- .which case an adjusting device for the rod 7 jand drums 1 willprobably be required.

dicator. `Fig5 isa cross section on the line 5 5 of Fig. 3. 'f

Similar reference characters refer tol like v parts throughout the several views.

t Scale springs become longer withincreas- 'Ing temperatures and expand-or Hex more for eachequal increasein load than when colder. In the lconstruction show1r-in-the accompanying drawings, a device is provided for counterbalancing the variation in stiffness of the scale springs, and also for bringing the indicating'drum to proper posi- .tion when the-scale is unloaded.

The indicating drums 1 are on a shaft 2 having a gear 3 secured thereto, which shaft is journaled nearv the -ends of the 'shell 4. A pedestal 6 supports' this shell and a rod 7 connects the gear 3 and the scale levers. All this mechanism together with the springs 8 may be-the same as that shown in' the patent above referred to.

The upper ends lof the springs 8 connect -to the plate 9 having an eye 10 through which a resilient bar 11 extends. This bar is mounted in the ends 13 of an oblong frame, the sides 14 of which may be connectby small cross bars 15 to prevent relative Nuts 16 on the ends of the bar or any other desirable means may be employed to hold it firmly in the ends 13.

The sides 14' are slotted to receive projectng guides. 17 ofl the small plates 18. :Perforatedl lugs 19 extend downward from t-hese plates and engage the lower sides of the bar 11. 1A short shaft 2O is mounted in the front side plate and carries a double crank 21 and a geark 22, movable wit-l1 the crank. Links 23 extend from the ends of ythe arms of the crank y21 to pins 24 on the guides' 17. It will' be seen that thel swinging -of the crank 21 will move the supports '19 of the bar 11 toward or from each other and` thereby vary the effective length: of. this sprmg.

A short shaft 26 journaled in the front i of the pedestal 6 and on its inner end. is

secured a gear 27 which meshes with the gear 22. A button 28 istheactuating member and has preferably a line 29 which may gpoint to graduations on the indicator 3 0. Any desirable meansmay be employed toposition the bar 11 in the pedestal, that fshown being a screw31 which engages one @of the end pieces 13.v f

The bar 11 may be straight if desired, in

spring bar 11 will of course, be stifest when cold so that the supports 19 will be farther apart for lower temperatures. lVhen the springs becomev warmer, it is necessary to compensate, not only for the decreased stiffness ofthe bar 11 but also of the springs 8, so the supports .19 will be moved toward each other to greatly reduce the dellection .of thebar 11.

It should-be understood thatl the increase or decrease in amount of deflection for given additions of load because of the change in Yposition of the supports 19 will just equal the respective 'decrease or-increase of the 'amount of deflection of the springs 9, be-

cause of this same additionl of load, on ac count of the change in temperature.

By'curving the bar 11 downward, compensation is affordedy for the expansion increasein length of the springs8 when unloaded, the movement of the support-s 19 toward each other raising the plate 9 and equaling the expansion of the unloaded springs. The lower ends of the springs will therefore be kept at the same height. Any expansion of the pedestal 6 will be equaled by an equal expansion of the rod 7.

Many details of construction may be changed by those skilled in the art without departing from the spirit of this invention.

Having now explained our construction, what we claim as our invention and desire to secure by Letters Patent is l. In a scale, the combination of a frame, a pair of vert-ical coil-springs, a transverse bar-spring supporting the same at its middle portion, said bar-spring being curved upwardly from its middle portion, and supports engaging the lower side of the barspring and simultaneously movable toward and from the coil springs to vary the eiective length and height of said bar-spring.

2. In a scale, the combination of a coilspring, a transverse rod supporting the same, a frame supporting the rod comprising side pieces and end pieces connecting the same, said side pieces having longitudinal slots plates slidably supported in said slots and having downwardly extending perforated lugs engaging the lower side or' said bar, a double crank mounted on the frame, links connecting the arms of the crank and said plates, and'means to recip- .rocate said crank to move said plates and lugs toward and from each other to vary the effective length of said rod.

3. In a scale, the combination of a frame,

a. pair of vertical coil-springs, a transverse bar-spring supporting the same, said barspring heilig curved upwardly from its middle portion, supports engaging the lower side of the bar-spring, and manually operated means for moving the supports toward and from eachother to vary the effective length and height of said bar-spring.

Il. In a scale, thc combination of a coilspring, a transverse rod supporting the same, a frame supporting the rod comprising sidepieccs and end pieces connecting the same, said side pieces having longitudinal slots, plates slidably supported in said slots and having downwardly extending perforated lugs engaging the lower side of said bar, and means to move said plates and lugs toward and from each other to vary the effective length of said rod.

5. In a scale, the combination of a coil spring, a transverse bar supporting the same intermediate the ends of the bar, a frame to support the ends of the bar, slidable plates carried by the frame and engaging the lower side of the bar, and means to move said plates toward and from t-he coil spring to vary the efl'ective length of the bar.

In testimony whereof, we have hereunto set our hands in the presence of two subscribing witnesses.

LOUIS JAENIGIIEN. BERT lV. KING.

Vitnesses GEORGE E. BENTON, Josnrri M. BCHER. 

